<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>求字符串数组中每一项的长度</title>
</head>

<body>
    <script>
        var arr = ["22222", "a", "", "aaaaa"];
        var newArray = [];
        for (var i = 0; i < arr.length; i++) {
            var len = arr[i].length;
            newArray[i] = len;
        }
        console.log(newArray)
    </script>
</body>

</html>